CN103286259B - A kind of cristobalite lost foam casting coating and preparation method - Google Patents
A kind of cristobalite lost foam casting coating and preparation method Download PDFInfo
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- CN103286259B CN103286259B CN201310275593.8A CN201310275593A CN103286259B CN 103286259 B CN103286259 B CN 103286259B CN 201310275593 A CN201310275593 A CN 201310275593A CN 103286259 B CN103286259 B CN 103286259B
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Abstract
A kind of cristobalite lost foam casting coating, it is processed by cristobalite, graphite, bentonite, organic binder bond and additive, it is characterized in that component takes cristobalite 10-90 by weight, graphite 5-90, bentonite 1.5-3.0, organic binder bond 2.0-4.0, additive 1.0-2.0, then add water, be mixed into starchiness, Baume degrees at 22-33Be ＇.The invention has the advantages that: good permeability, suspension is good, and after coating cast, volumetric expansion change is little, and the performance that the bright and clean coating of cast(ing) surface can shell automatically is cost-saving, and technique is simple, and improve the yield rate of foundry goods, it extensively should be processed in the casting of metal.
Description
Technical field
The present invention relates to the coating that a kind of cristobalite lost foam casting process uses, be specifically related to a kind of a kind of cristobalite disappearance die casting coating and preparation method of field of metal casting technology.
Background technology
Lost foam casting process is generally first be made into model with foamed plastics or other organic matters, then on organic matter model coating refractory coating; The mould of coating refractory coating is imbedded sand railway carriage or compartment, then vacuumizes and form certain negative pressure, the pouring metal melt of melting is entered mould, organic matter model disappears, and molten metal just obtains product after filling up cooling---foundry goods.Technology of EPC is a kind of casting technology, and its energy rapid shaping is the novel casting technique of casting now the execution of industry popularity.One of core technology of Technology of EPC is exactly the coating of dispellable mould casting, and the performance quality of coating is related to the yield rate of foundry goods, and the performance of coating is the important decisive factor of lost foam casting process production link.
Acid coating is divided into, neutral coating according to the difference of coating refractory aggregate.Wherein acid coating, neutral coating are mainly for spheroidal graphite cast-iron, in the casting of iron, carbon steel, especially the gearbox of automobile engine, start the nullisomic of mechanism, the casting lacking lid and urban water supply and sewerage channel bend and valve, the foundry goods such as lathe support, the lost foam casting coating formula that they adopt is:
One, silica flour+bentonite+CMC+ benzene emulsion+coating additive, concrete formula is prepared as follows: silica flour is containing 90%, and bentonite is containing 2.5%, CMC is containing 1.5%, and benzene emulsion is containing 4.5%, and coating additive is containing 1.5%, then add appropriate water, mix and blend is exactly water base carbon dust lost foam paint.
Determined by the physical characteristic of silica flour, natural quartz powder is adopted to do the lost foam paint of fire-resistant aggregate when moulding by casting, coating affects by molten iron or liquid steel temperature, quartzy class expanded by heating, and coating easily ftractures, make casting material surface jagged, overlap is again due to silica flour volumetric expansion, makes cast(ing) surface produce vein, Ding Ba, the unfavorable conditions such as burning into sand.Adding natural quartz powder is processed by natural quartz mine, and the chemical analysis stability of silica flour and homogeneity are difficult to the chemical analysis reaching silica flour, the height of silicon content, determines the refractoriness of coating, determines the serviceability of coating.
Two, graphite powder+bentonite+organic resin+alcohol+coating additive, concrete formula is prepared as follows: graphite powder is containing 90%, and bentonite is containing 2.5%, and phenolic resins 3.5%, alcohol 1%, coating additive 2% is exactly the graphite powder lost foam paint of alcohol radical after mix and blend.
To be that refractory aggregate is common exist coating poor air permeability to graphite, after casting, coating can not shell automatically, graphite paint is blacking again, its reason is the foundry goods adopting lost foam casting process to obtain, coating can not shell automatically, and expiring when workman moves foundry goods all can by powdered graphite ink in whole face, and working environment is very severe.
Graphite powder lost foam casting coating of the prior art, fireproof coating is generally natural carbon dust.
Natural carbon dust is mineral crystal structure, not hydrophilic, so coating suspension is bad, need to dose more organic binder bond when manufacturing coating, and organic binder bond is added, the direct steam exhaling amount affecting coating, the steam exhaling amount one of coating is large, directly causes foundry goods to have pore, sand holes, affect the end product quality of foundry goods, this is the main cause of a lot of foundry enterprise self-control coating products quality instability.
Three, diamond spar powder+bentonite+organic binder bond+coating additive, concrete formula is prepared as follows: diamond spar powder is containing 70%, and bentonite is containing 2.5%, CMC is containing 1.5%, and phenylpropyl alcohol liquid is containing 4.5%, and other coating additives are containing 1.5%, then add appropriate water, mix and blend is exactly water base carbon dust lost foam paint.
Adopt diamond spar, English powder to be refractory aggregate, although product is stablized, cost is high, and product is expensive, so market is badly in need of the lost foam casting coating of a kind of environmental protection, efficient, stable performance.
Summary of the invention
For overcoming above-mentioned shortcoming and defect, the present invention aims to provide a kind of good permeability, and suspension is good, and after coating cast, volumetric expansion change is little, the lost foam casting coating of the superior performance that the bright and clean coating of cast(ing) surface can shell automatically.
Core of the present invention is that formula is: cristobalite+bentonite+graphite+organic binder bond+additive, concrete preparation component by weight: cristobalite 60-90, graphite 30-40, bentonite 1.5-3.0, organic binder bond 2.0-4.0, additive 1.0-2.0, add water again, mix and blend pulp, Baume degrees 25-33Be ＇, what obtain is exactly cristobalite lost foam casting coating.
Organic binder bond alleged by the present invention is lignin sodium carbonate, and additive is dextrine powder.
The present invention not to occur at about 1470 DEG C that volume is swollen to rise due to cristobalite, and the coating gas permeability produced is stablized, and coating suspension is good, and cast(ing) surface is bright and clean, is a kind of very excellent coating.
Cristobalite of the present invention refers to that cristobalite powder is aggregate, the very rare of ore deposit is become separately with the crystalline phase of cristobalite at nature, therefore cast paint and casting are all be all natural siliceous sand, silica flour with quartz sand, silica flour in prior art, its crystalline phase is generally α-cristobalite α-tridymite, and cristobalite just refers to α-cristobalite, it be by alpha-quartz after being ground into 300 order particles, make alpha-quartz crystalline phase be converted into α-cristobalite crystalline phase material in the high-temperature calcination being greater than 1470 degrees Celsius again, regrind after calcining and be fine into the powder that particle diameter is 15-40nm.Cristobalite has the unexistent physical characteristic of general natural quartz: cristobalite is stablized being less than under the hot environment of 1713 degrees Celsius crystalline phase, and cristobalite does not have Volume Changes.Cristobalite is by natural quartz through high-temperature calcination gained, and wherein K, Na, low-temperature metal ionic species seldom, do coating with cristobalite, and coating heat-resisting quantity is very stable.In high temperature casting, there is no the volatilization of K, Na, therefore foundry goods can not produce escaping gas, thus improve fineness and the precision of cast member.
The present invention utilizes this characteristic of cristobalite, regulate the content of cristobalite in coating, the casting consistent with metal casting molten metal condensation shrinkage factor can be obtained and make a concession performance, this is that the present invention adopts cristobalite to produce coating, lost foam casting process adopts coating cast(ing) surface of the present invention bright and clean, size is accurate, the crucial factor that allowance is little.
The invention has the advantages that: good permeability, suspension is good, and after coating cast, volumetric expansion change is little, and the performance that the bright and clean coating of cast(ing) surface can shell automatically is cost-saving, and technique is simple, and improve the yield rate of foundry goods, it extensively should be processed in the casting of metal.
Specific embodiment
First cristobalite is produced: carried out by quartz being ground into 100-300 order particle, again quartz particles is placed on calcination in the kiln of 1700 degrees Celsius, regrind after calcining and be fine into the powder that particle diameter is 15-40nm, be obtained cristobalite, then obtain lost foam casting coating of the present invention by the following example.
Embodiment one: component takes cristobalite 80 by weight, graphite 40, bentonite 2.5, organic binder bond 3.5, additive 1.5, then add water, be mixed into starchiness, Baume degrees is at 33Be ＇, and what obtain is exactly cristobalite lost foam casting coating.
Embodiment two: component takes cristobalite 90 by weight, graphite 30, bentonite 2.5, organic binder bond 3.5, additive 1.5, then add water, be mixed into starchiness, Baume degrees is at 25Be ＇, and what obtain is exactly cristobalite lost foam casting coating.
Claims (3)
1. a cristobalite lost foam casting coating, described coating is processed by cristobalite, graphite, bentonite, organic binder bond and additive, it is characterized in that component takes cristobalite 60-90 by weight, graphite 30-40, bentonite 1.5-3.0, organic binder bond 2.0-4.0, additive 1.0-2.0, then add water, be mixed into starchiness, Baume degrees at 22-33Be ＇.
2. a kind of cristobalite lost foam casting coating according to claim 1, is characterized in that component takes cristobalite 80 by weight, graphite 40, bentonite 2.5, organic binder bond 3.5, additive 1.5, then add water, be mixed into starchiness, Baume degrees at 25Be ＇.
3. the preparation method of a cristobalite lost foam casting coating as claimed in claim 1, it is characterized in that: the first step, quartz is carried out be ground into 100-300 order particle, again quartz particles is placed on calcination in the kiln of 1700 degrees Celsius, regrind and be broken into 15-40nm powder, obtained cristobalite, then component takes cristobalite 60-90 by weight, graphite 30-40, bentonite 1.5-3.0, organic binder bond 2.0-4.0, additive 1.0-2.0, then add water, be mixed into starchiness, Baume degrees at 22-33Be ＇.
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| CN201310275593.8A CN103286259B (en) | 2013-07-03 | 2013-07-03 | A kind of cristobalite lost foam casting coating and preparation method |
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| CN201310275593.8A CN103286259B (en) | 2013-07-03 | 2013-07-03 | A kind of cristobalite lost foam casting coating and preparation method |
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| CN103286259B true CN103286259B (en) | 2016-01-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104493076A (en) * | 2014-12-08 | 2015-04-08 | 昌乐恒昌化工有限公司 | Calcined quartz powder casting coating and production method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900286B (en) * | 2017-12-04 | 2019-05-17 | 东方电气集团东方汽轮机有限公司 | A kind of fused quartz ceramic shell preparation method |
| CN111531120A (en) * | 2020-04-27 | 2020-08-14 | 埃肯铸造(中国)有限公司 | Preparation method of novel casting coating |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2015790C1 (en) * | 1990-06-06 | 1994-07-15 | Институт проблем литья АН Украины | Antistick agent for disposable patterns |
| CN101041548A (en) * | 2007-03-05 | 2007-09-26 | 中国地质大学（武汉） | Method for preparing cristobalite by calcining quartz |
-
2013
- 2013-07-03 CN CN201310275593.8A patent/CN103286259B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2015790C1 (en) * | 1990-06-06 | 1994-07-15 | Институт проблем литья АН Украины | Antistick agent for disposable patterns |
| CN101041548A (en) * | 2007-03-05 | 2007-09-26 | 中国地质大学（武汉） | Method for preparing cristobalite by calcining quartz |
Non-Patent Citations (1)
| Title |
|---|
| 消失模铸造水基涂料的研制;陈峰;《热加工工艺》;20080810;第37卷(第15期);43-44 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104493076A (en) * | 2014-12-08 | 2015-04-08 | 昌乐恒昌化工有限公司 | Calcined quartz powder casting coating and production method thereof |
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Effective date of registration: 20160224 Address after: 14 building 337000, economic and trade building, Pingxiang Economic Development Zone, Jiangxi Patentee after: PINGXIANG CITY TONGKAI TECHNOLOGY CO.,LTD. Address before: 337000 Xia Shi management office, Pingxiang Economic Development Zone, Jiangxi Patentee before: Huang Jianrong |
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Effective date of registration: 20191129 Address after: Room 602, unit 2, building 12, Fenghuang villa, Muke East Road, Pingxiang Development Zone, Jiangxi Province Patentee after: Huang Hongan Address before: 14 building 337000, economic and trade building, Pingxiang Economic Development Zone, Jiangxi Patentee before: PINGXIANG CITY TONGKAI TECHNOLOGY CO.,LTD. |
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